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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba47dfa791177b5fc829dba0e0ce9854fff1d3ae80525e01f9784e63e17f79f6' 
  AND token = 'Dn0BqIigdfWeMYq4s/ZsSH+dvyN3Gnrb3rXpjGv3MpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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