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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19000b2da2531a1f4a4cf7226bfd8ad97066e82378eeacad629e866934253e23' 
  AND token = 't7A66QJmFzN5xHVdSJzw6+60AMQE+5kxJyR34azlHbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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