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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e5d3f29467bc30649dc20d3b0f1e23ce1724ff7ddfaa02295030a71e1f7f3f' 
  AND token = 'y2Et7xs/o4ERPUjNX/0T0k/1CRjWS+u/LhlnRQjQ65s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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