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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7072495f63c125615a4aa1be542d0d01ec2d896142f251124d79be2a4dd076' 
  AND token = 'fQu9zrjjNgMEVAlV7keU2wKpxJwUrk5/s5h3/Tyqvac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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