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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1268d9984d3ed5882fc1f2b3496dbae1edbc7159bd8483de8b079601cd45d7e3' 
  AND token = 'LQaN+4mnUhsD3958gq9+nRK+EYpMT5xtQdiLiIOzI+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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