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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d655161425f0e7ab2c4461d8d81a25528a0fbb73f9b6b7be05a8d3efafd0795' 
  AND token = '38Am+482ikileWRY5es85YKnXZsvPIqkrjA/vidqFf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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