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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc02225330477419bf803079ebeeafdcb48f05db8d2999a034ead2492d26099' 
  AND token = '9Wr43hyPAG7CVcaQ8dxxr1E64o6IpPULv6udyJn/hW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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