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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97bbe867a343440cee34727c5bd32e0675bf986d6eee07d51d82f9c5251f934' 
  AND token = 'JzWr+JE/92UDeMcq0/FkpVt+vbyIT9BULymZXoP5BkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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