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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bab93b5a11ac1b33562084bcf3828d770321b284765e71f970e763c4171cc6' 
  AND token = 'stq4SigY39RJnJohs95j3wweSR5i4mB9uaUdsRixeMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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