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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97204dc5e697a98c5f05f5a47d3192d1bffebd0ff365c1b02163bbffc01f52cf' 
  AND token = '0KWtB8fpBr9jSYgKlrFFSLLX+mARiNYR8JnNQ/Y5Njs=' 
  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"
    }
  }
}