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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2235ebbf20f3773dcb62cb93b460793dd4ccd3697517f1fcc361e6c0b854e172' 
  AND token = 'onctpDJM5QCFG3R1ZL4LbucwMCxT1TR/lw6m2lePHS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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