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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e3fb7d475ac5b21abe451ca43342d9d9ed41fc43e8402ce473b87922279b4e' 
  AND token = 'Y4TRI2Ip3+82geLUU5u/CtKm5XBSbo3Bk9voesXV/zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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