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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a091515df19e0f55745e0250eb6e43775915562d6ce24bab005ff0d4b17934' 
  AND token = 'fWZSVyeYR9eQeNIqcMjtqCCz/HV0gcGnxr9yu4rDf9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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