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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97229613440b2c9511a7816673e4dba4baf80518142514a50e81523224da25ec' 
  AND token = 'uzmUYinik01TggSWUGvkx315ogKP8mk7Wk0R7E4zHjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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