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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1cf65cd9d28a1502e88b46681a680e68f37c595d7858a88109df5f0cf38ac85' 
  AND token = 'IyIR/Rfz4PZPU1VsylpYmzvDTCRXBwxV3tDjH6GEib8=' 
  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"
    }
  }
}