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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b79b5f3fb2e0c587ec199677d3efb20895f90549fc786daeaf8c953186b32d' 
  AND token = 'Qw9Ze4MRJmJL3WJUO4y/4YY3dlfdPahAcV6LIna5Jow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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