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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8911e94f2a9e481349b0831bdac9c8bc48ee5912192c2277bf22c559badb97f' 
  AND token = 'ulFnNIpZ/i/DJ+3Wsxl2FiucwGfMj+Xt55uDm1zb0jo=' 
  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"
    }
  }
}