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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf2c8e072954540d2373a1a42131b1ee4c69c8d7f803498ade6bb94b3440845' 
  AND token = 'TE9ygTKTZWKozD6eoYbM+kri0sz1BtGcwX79mHjVSS4=' 
  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"
    }
  }
}