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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15dcc14f197e0690c94820821982c262149a87e222a300827d74ce4ebb72669f' 
  AND token = 'OwYQc5eiQUR1eNN0ydxI21rLQ3DqGJp6RHs/MRKsFyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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