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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2fc4234ae0856fb8d78ef9e8af266ef8d0bba56262816799bd640a56df2b2ee' 
  AND token = 'v9ALoP0KfN+A388YeMljxVcN4+w9XoC3O/4RK/dnvug=' 
  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"
    }
  }
}