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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0854fc9cbdd0110a780f6ca4e1098f096c4bc506bc0167220f51194af95ce341' 
  AND token = 'TkM9XfwSa/RRI4r31nQD4LufI8Ol66RG/co+ks/NN7A=' 
  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"
    }
  }
}