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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e0dd0b8e813d7441184217b7932c39b5b82a35936e23e9d179c27ab258a921' 
  AND token = 'O9BzCAdzove7hP3HssF0pY6jW0txvZnhjyj/UimpVMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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