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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd390d93ac97f13bc9a21e568df53f1db4844f9aa347db1b3081cfdb7caebce' 
  AND token = 'cR3i/ln/39Fo06WmT2OU3jGb/FcIDq/NmACJ9ouY0PY=' 
  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"
    }
  }
}