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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3d76959804b16432608e334c243d88b6bfacd57ff5bf4af00fd19d0ed5b6ae' 
  AND token = 'eig4AoWcPxJGcHUR5aIa4cfrFCmHkrDJqIWiUPC/Gv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00262

JSON explain

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