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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d5538ed1d5bcb31bef7d9d05263b87a2106b7eb0e36734b712ac891939cfef' 
  AND token = '+a5F9Bzz44pAneJUCyxQpG9WiVNDqbAkdXmwq5n9FgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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