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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '442b73504ce80652e059c82fdffc2c97e0c25b3c6d3d26da8b712edc1cb58d46' 
  AND token = 'x+cJDNd41CMXNt4BknI1WreOPOK/bSzvlYIeNad2ax0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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