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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a5e7c4dc540c2f57f82b63298be129e0e9084b590e31223537f3f8e84c6a65' 
  AND token = 'q6IO2SPu/qC1OIwg6Q936NJ2294gGMSciH7pnyo5JaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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