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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fca96b1fe90767d8d1a968b934c33a2f3f9360a2e510de5e75517a4e8266a6' 
  AND token = 'MTTpXfIV0ljvqf6GFNiWts5s2MB0gXGfPqbk0tSW/b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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