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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef648bb83cbc8e136e70fc0f89089e3fb90d4a7dd1fadbd7b0dd017f17c0138' 
  AND token = 'B1XVlD7BcrWyxpygqPzGNyCT5Nnbz6B5I3kD1pHkAts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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