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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9039fef17743865c6c4a5b402c7d1c0595336700340d9b2a451cf8cdbe26900' 
  AND token = 'X4HsDIEXn82f/s/SDSVp86pt/DIfLzCvpaw5tPunxKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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