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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7437decc18c6da2a873151eebc0ffa9ed52e27d182096b990e62b31c26f8c67d' 
  AND token = '7dP5QdL+BEuXYTNeynqXRzM2og2dLsTkiFdBH7T9q+M=' 
  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"
    }
  }
}