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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c9cb9d5800230facc674c228d14745e7a004ea4d0bf01cb5e112bdc11b5dbd' 
  AND token = 'l8IVrdMxyIhmm7yFce2B6GZwCW7ycUlYPU3tv0D32Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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