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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31535010c64b0c0af9e9ad3add7f60759d28d349431c161c8d1cf1ad83b2f7f8' 
  AND token = '2k7daX7P9ymLHctKqqYniP4e9TzfZtff6wGLUmaZ2ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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