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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fcdae8e86aa00354708f842e8a55e7ef3c306670abe1c98a7b52aff22f27a1' 
  AND token = 'OnQ9l74T9+fZ2EXYx1ZKYJ/NO0dxSUzCmLCT7SPClpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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