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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d76972a63032e04ead83020254e57024bc04deef4a2711f18542a92297621e4' 
  AND token = 'UyU0zzkeOzxJHTS8Bw+8S1MZuPgVoZLa6u72BRMXy5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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