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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c50024e60da5dbbfa8c6ccbabc7f50ebf38072335fb2eaf07a6a2c1c4faa5e' 
  AND token = 'KtqJxuq6K0t5W8EUJ1351I8ATn2CsBPuWeernA9gfaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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