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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5777ef9a17499c550ddf75e4dac0e04bdba88be4ea7fb6b430c5c6a5dff3a8a0' 
  AND token = 'QDd6VKZXB72smku82TTDoLjWYJdsCGIcbMba8PgMs54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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