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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b5fcc28e93eb5fa71727505f95f1d294090575efde249422c210d315adba44' 
  AND token = '4Uw9Koj+l3TIjrdIYSRqgCRZkHZOyO12ZEEZ8dPf2Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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