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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafea1d19c94a0a0541057ed535755bedfde98f4e4ebd4b7ecaf6abd35a79d5d' 
  AND token = 'Fx+0rXJ9Td6NOaPfiFLZqlGU7vJXdU9S+SjXOg76GwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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