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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a672f27077b9fa5c1243d6103e92c7c7605d73534b79c256eb74dab86730966' 
  AND token = 'UrnPzFBzxNRGxFgKosB3cA+WkcnPHXbXOZZP4anA670=' 
  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"
    }
  }
}