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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2110b35ea110aea003033125f78506c8d39f78d96f6f6d68f3bb218eff5fd28' 
  AND token = '0lfa5G2pUoraUB+/CIPL777gZLk+7jB/OzkZwc1aIf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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