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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8150e1b64ae990f4d9f5c0d8f89cf81c483dbaacabd035bf15a1c4f9ba9b0b2c' 
  AND token = 'qdcRRaii72p/xfvSI5R8Fy5ElKipGAwc0ERIj64FuEs=' 
  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"
    }
  }
}