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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2086a48d4f6ec21ba4edebc67445496f227d8215bd4c1e0c26c259e2bfed92' 
  AND token = 'iVCT5pe0JAhLprbg8uL7a5wioCqrd0/cC+mE3q8Hx1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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