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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd5475296b0c0341f1fb77cc22fe1564bcd2c4ff6875b9d83c31fb1fb6c9f94' 
  AND token = 'lLfNyIlZhs0ZhZR7kXiAJWXYQ4H0vxjpbIBEwlRABf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}