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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a615d14830510e8c0a294f1c2edcfc9a390de1b4217a21d560e2fda8ee0d39ad' 
  AND token = 'HiJusaD4xf2OIQkmio2d92Eb9O4UV4i6B8liLQw5Gqo=' 
  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"
    }
  }
}