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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e9a0aa09a5f6779c6857377dd97d1ad93e40b909f4bbcaf2e7cf18db82ee2d' 
  AND token = '1ftH3fWEqwwEf1+xbd6N1fG8QVVp9UOTOmODN2U/XtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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