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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149df0f8442daaf8f9b08cf79e9abe1851c517f950d35adc9af118d5751e4d6e' 
  AND token = 'bSBWIruqGoHZcnPI8bvblSDYe785/MX4PAzHfd1ojPw=' 
  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"
    }
  }
}