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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d202e2b21dddfd27a9a62050739df7dde4e5cfb88530735dd788ffd0b27950' 
  AND token = 'RTzVgQZTAb1mFySAXeOiLu7xkg8OJybJe/lvj8jVNhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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