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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9988102978f2cf9716f5680a9aec6f5c5dd0b3def720ee7b80d62b80de180f1d' 
  AND token = 'dglmOJ1rTCqGVhsz1CIIYYJek8Kjx30PoiM+I/rTMO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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