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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16937ae2a678a0ab0776d9cdf6199b3e9189e9ca214b4a7bb1e3ec9ac1b411f' 
  AND token = 'YI0ZC63VzsVtB1jQR44pwiAWE1y9OPuiY+lSVMOoMHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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