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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1ab9ad9c140a01b902feabbe76ef3f8adcd399fb9a17b3d25aa0b3ea784ac3' 
  AND token = '3uyV7H1fKa2svTIzX+u+Ni6yrCwwWVSPDVEJ4gPCGvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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