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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487c1b8d7280d1b4b1ac2050fb6e45aa60fb31ceb3f12cd37d4a3ffe936a0e3c' 
  AND token = 'CJWv2WFFJCMiwa5Z3baikkljJzKTqPHfsKac2/mrkIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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