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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2038e62fca146e5d61ba4d305f32165f82278ac7557f0828328561aca6cb15bb' 
  AND token = 'L0zesksSnkvWq/dW19KRM780DaA7DIGjpjebUj++QBg=' 
  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"
    }
  }
}